Abstract

In recent years, there has been an increasing
public concern about possible health hazard resulting
from exposure to electromagnetic (EM) waves. Much
attention has been paid to the induced of SAR in the
human head for exposure to EM waves emitted from
commercial cellular phone antennas. Therefore, the
computation of the electric fields and SAR generated by
cellular phone inside a four-tissue phantom head model
is presented in this paper. The phone was considered
working at 900MHz to 1800MHz bands according to the
Global System of Mobile Communication (GSM). The
penetration of the E-fields and averaged SAR values in
1g and 10g of tissue were computed inside the model of
human head using Finite Difference Time Domain
(FDTD) technique. The E-fields and SAR are then
evaluated using CST Microwave Studio as it capable to
do an accurate 3D simulation. The CST Microwave
Studio results show that magnitude of EM field
decreases exponentially with the penetration distance at
a rate specified by the attenuation constant, α. Besides,
the SAR is affected by operational frequency of the
phone and the distance of the antenna to the human head.
An experimental technique on SAR distribution needs to
be done to validate the results from simulation
technique.